See commons:User:Aymatth2 for Wikimedia profile.
Why did I undo your change?
Probably because you added content that was not verifiable. The new content seems implausible or controversial and is not backed up by citing a reliable source. If you can find a reliable source, by all means put your content back in – citing the source. Another reason may be that you removed content that is backed up by a reliable source.
Wikipedia's goal is not to present the truth about each topic but to present what is thought about each topic, giving greatest weight to the most widely held opinions.
My vision and coordination are poor. You may simulate the effect by holding the mouse in your non-dominant hand and wearing eyeglasses lightly smeared with Vaseline. I often rearrange sentences while starting an article until the most natural sequence emerges. It is easier to do so if each sentence ends with a single line break. I click in the white space to the right of the sentence, drag the mouse to the left margin to select it, then cut and paste using the keyboard. It is much harder to position the cursor precisely at a point within the text, then drag to another point within the text. I am not the only one with poor vision and coordination. This is why the Manual of Style says "a single line break may follow a sentence, which may help some editors." Single line breaks make it easier for physically handicapped people to edit text, and are invisible to readers. I ask that you do not remove them.
I mostly access Wikipedia from a laptop with a separate keyboard and large upright screen, but sometimes use my phone later in the day to take a look at articles I have been working on. This is probably good practice anyway. What looks good on a big screen may look bad on a small one. If I spot a typo or awkward phrasing I may fix it on the phone without logging in. So if an IP that belongs to a beachside café in the Guanacaste province of Costa Rica makes a minor edit to an article soon after the last edit by Aymatth2, that is probably me. But I would not make an IP edit on anything controversial.
Long ago I used user:Bymatth2 for test purposes.